In A Skillet, Brown Beef; Drain. Add The Macaroni, Onion, Green Pepper And Pizza Sauce. Pour Into A Greased 2-1/2-Qt. Baking Dish. Cover And Bake At 350 Degrees F For 20 Minutes. Uncover And Sprinkle With Cheese. Bake 10-15 Minutes Longer Or Until The Cheese Is Melted.